An overactivated ATR/CHK1 pathway is responsible for the prolonged G2 accumulation in irradiated AT cells.
Wang X, Khadpe J, Hu B, Iliakis G, Wang Y. An overactivated ATR/CHK1 pathway is responsible for the prolonged G2 accumulation in irradiated AT cells. J Biol Chem. 2003 Aug 15; 278(33):30869-74.